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In page Complement-dependent cytotoxicity:

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CDC assays are used to find a suitable donor for organ or bone marrow transplantation, namely donor with matching phenotype of histocompatibility system HLA.[1] At first, HLA typing is done for patient and donor to determine their HLA phenotypes. When potentially suitable couple is found, crossmatch test is done to exclude that patient produces donor-specific anti-HLA antibodies, which could cause graft rejection.[citation needed]